1. Chemical
Equilibrium
A Balancing Act

2. Equilibrium
two opposing processes occurring at the same rate
a system at equilibrium is in balance

3. During a game, players enter and leave.
Always the same number of players on field.

4. H2O(l) H2O(g)

5. Saturated solution of NaCl
Total amount of dissolved NaCl remains constant
Total amount of undissolved NaCl remains constant
Rate of Solvation = Rate of cystallization

6. Photochromic
sunglasses
AgCl + light Ag + Cl
(transparent) (dark)

7. Reversible reaction
a chemical reaction that can occur in both the forward and the reverse directions
N2(g) + 3H2(g) NH3(g)

8. N2(g) + 3H2(g) 2NH3(g) Start of Rxn Reverse Rxn has begun
Rxn at equilibrium

10. Chemical equilibrium
a state in which the forward and reverse reactions balance each other because they take place at equal rates
dynamic state; no net change

11. Equilibrium favors the reactant side
N2O4 (g) NO2 (g)
equilibrium
equilibrium
equilibrium
Start with NO2
Start with N2O4
Start with NO2 & N2O4
Equilibrium favors the reactant side

12. Quick Quiz.
1) When a reaction has reached equilibrium, reactants and products
have stopped reacting.
continue forming, but at equal rates
C) have equal concentrations.
D) decrease in concentration.

13. Quick Quiz.
2) What is a reaction called in which products can react to re-form reactants?
Reformation
B) Reversible
C) Buffered
D) Impossible